How to find length of dictionary values

Question

I am pretty new to all of this so this might be a noobie question   but I am looking to find length of dictionary values    but I do not know how this can be done   So for example   d     key    hello    brave    morning    sunset    metaphysics      I was wondering is there a way I can find the len or number of items of the dictionary value   Thanks

User · Answer

To find all of the lengths of the values in a dictionary you can do this   lengths    len v  for v in d values

User · Answer

A common use case I have is a dictionary of numpy arrays or lists where I know they re all the same length  and I just need to know one of them  e g  I m plotting timeseries data and each timeseries has the same number of timesteps   I often use this   length   len next iter d values

User · Answer

Lets do some experimentation  to see how we could get interpret the length of different dict array values in a dict   create our test dict  see list and dict comprehensions    gt  gt  gt  my dict    x  i for i in range x   for x in range 4    gt  gt  gt  my dict  0      1   0   2   0  1   3   0  1  2     Get the length of the value of a specific key    gt  gt  gt  my dict 3   0  1  2   gt  gt  gt  len my dict 3   3   Get a dict of the lengths of the values of each key    gt  gt  gt  key to value lengths    k len v  for k  v in my dict items     0  0  1  1  2  2  3  3   gt  gt  gt  key to value lengths 2  2   Get the sum of the lengths of all values in the dict    gt  gt  gt   len x  for x in my dict values     0  1  2  3   gt  gt  gt  sum  len x  for x in my dict values     6

User · Answer

d  1  a  2  b   sum 0 for i in range 0 len d  1      sum sum 1 i i 1 print i   OUTPUT 2

User · Answer

Sure   In this case  you d just do   length key   len d  key       length of the list stored at   key         It s hard to say why you actually want this  but  perhaps it would be useful to create another dict that maps the keys to the length of values   length dict    key  len value  for key  value in d items    length key   length dict  key      length of the list stored at   key

User · Answer

Let dictionary be     dict   key    value1   value2    If you know the key    print len dict key    else    val  len i  for i in dict values     print val 0      for printing length of 1st key value or length of values in keys if all keys have same amount of values

[python] How to find length of dictionary values

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